CN1306807A

CN1306807A - Thin sanitary cotton wool

Info

Publication number: CN1306807A
Application number: CN00126245A
Authority: CN
Inventors: C·拉里维埃; R·默哈默德; Z·穆吉
Original assignee: Johnson and Johnson
Current assignee: Johnson and Johnson
Priority date: 1999-08-16
Filing date: 2000-08-16
Publication date: 2001-08-08
Also published as: DE60019210T3; AU767063B2; BR0003632B1; EP1077052B2; BR0003632A; DE60019210T2; TW490300B; CA2316472A1; RU2246921C2; AR025291A1; MXPA00008006A; CZ20002980A3; KR20010021322A; HK1032529A1; EP1077052A1; CZ302187B6; DE60019210D1; ZA200004162B; AU5343000A; EP1077052B1

Abstract

The present invention provides a sanitary napkin that is thin (less than 5mm in thickness), highly absorbent and has a lateral flexibility allowing for controlled deformation when in use, namely the assumption of a 'W' pattern. This controlled deformation provides a good comfort potential and simultaneously reduces the likelihood of bunching due to compression forces exerted laterally against the napkin by the thighs of the wearer. In a specific example, the sanitary napkin is characterized by a pair of preferential bending zones extending along the longitudinal axis of the sanitary napkin and by a pair of longitudinal adhesive zones on the liquid-impervious barrier layer of the sanitary napkin, that register with the preferential bending zones. The longitudinal adhesive zones fasten the sanitary napkin to the undergarment at the areas at which the sanitary napkin is intended to fold when subjected to lateral compression. This feature allows the napkin to fold and adopt a desired three-dimensional deformation profile in a predictable manner when laterally compressed.

Description

The slim cotton wool of controlled-deformation when easy to use

The skill of the general relevant absorption of fluids of the present invention, and particularly relevant a kind of available Hou promptly loses the cotton wool of formula, it is that approach, high-absorbable and the distortion can control use the time.

The mode of the distortion when the contributive key element of a kind of performance to cotton wool is cotton wool opposing use.Find: in the time of on cotton wool is positioned with use what underpants, individual's thigh applies side force what cotton wool.This causes the cotton wool collection to hold together, and influences the efficient of the ability of cotton wool collection of bodily, because the surface area of cotton wool has reduced.To what thin, highly flexual cotton wool is all the more so.

A kind of method that as far as possible reduces this problem is: make cotton wool more stiffening to make it more to resist the influence that side pressure is contracted.But the method has an adverse influence to the comfortableness of what cotton wool, because the stiffness of being added influences cotton wool the moving of all directions, and makes it more be difficult to comply with user body's natural shape.

For resist this problem, can find out have need provide a kind of what to use the time more comfortable and still can reduce the cotton wool of gathering probability, to promote the fluidic whole efficiency of collection of bodily.

In what one viewpoint, have at least one pair of priority bending district in the absorption system of cotton wool of the present invention, its each other side direction (laterally) separately, and it is along the vertical axis extension of cotton wool.Cotton wool comprises that also side location coheres the district, and it also aligns along the vertical axis extension of cotton wool and with discrete priority bending district.The district is cohered in side location can be with the fixing zone that generally meets the priority bending district on the what user underpants of cotton wool.The effect of this structure is: promote the folding of absorption system in the priority bending district, and promote the formation of certain 3 D deformation profile in the cotton wool, to respond the lateral compression that the user thigh is applied.

In a specific embodiments of the present invention, the absorption system of cotton wool comprises a central priority bending district, the middle body of its what absorption system, longitudinal extension between this is to the priority bending district in addition.When what used, the 3 D deformation profile of cotton wool hypothesis under this specific embodiments was to respond the side force that the user thigh is applied, this similar letter " W ".

This is found to be useful, even indispensable to the cotton wool right and wrong that the warp resistance with many what 400g is provided.The cotton wool that this characteristic provides is very stiffening with enough stable, and therefore allows cotton wool folding in a kind of mode of prediction, and the probability of gathering when avoiding what to be subjected to lateral compression.

Other viewpoint of the present invention and characteristic are read following specific embodiments of the present invention and the relevant people who is familiar with the industry who cooperates the explanation of figure to what, are quite obviously to reach clearly.

Fig. 1 is the top view of cotton wool of the present invention, and wherein the cover layer of cotton wool is removed so that absorption system to be shown by the part;

Fig. 2 is the axonometric chart of Fig. 1 cotton wool, illustrates when cotton wool and is put state in the underpants of what user.This state is the state that applies the what cotton wool without any lateral compression;

Fig. 3 is the bottom view of Fig. 1 cotton wool;

The drawing in side sectional elevation of Fig. 4 for obtaining along the vertical centrage of Fig. 3 cotton wool;

Fig. 5 puts the sketch map of the mechanism of one of the absorption system of absorbing material formation cotton wool of the present invention absorbed layer example for air feed, wherein use four gas to put head, and its Hou is put the mechanism of material with work in order to compress this gas;

Fig. 6 (a) and 6 (b) illustrate three layers and four layers of embodiment of absorbed layer of the absorption system structure of available what cotton wool of the present invention respectively; And

Fig. 7 is the drawing in side sectional elevation of the cotton wool of Fig. 1, and it is folding according to " W " pattern that cotton wool is shown.

Fig. 1 and Fig. 2 show embodiments of the invention, and a kind of women uses cotton wool 20.

Cotton wool 20 has main body 22, and first cross side 26 of main body 22 defines front end partly, and second cross side 28 of main body 22 defines Hou end part.Each is arcual or any other suitable shape for these sides.Main body 22 has two vertical lateral margins, i.e. first vertical side 30 and second relative vertical side 32.The thickness of cotton wool 20 is no more than about 5mm.Thickness is good with little what 3.5mm, and little what 3mm is for better, and about 2.8mm is best.

Cotton wool 20 has vertical Central Line 34, and it is an imaginary line that cotton wool 20 is divided into two identical one side of something.

Cotton wool 20 in the diagram has fin (38,40).Fin (38,40) laterally protrudes outwardly from each first vertical side 30, second vertical side 32.Fin 38,40 is isosceles trapezoid, and trapezoid top margin connects this vertical side, and trapezoid base is at far-end.This is an example, can not break away from spirit of the present invention because other airfoil also can be used.Again, the not limited what of the present invention has the cotton wool of fin, because notion of the present invention also can be used the cotton wool that what does not have fin.

Body 22 also has an imaginary cross central line 36, its vertical what longitudinal centre line and divide

fin

38,40 simultaneously equally.

As shown in Figure 4, main body 22 be stromatolithic structure and preferable contain one can saturating fluidic cover layer 42, absorption system 44 and fluid-tight barrier layer 50.Absorption system 44 has 2 assemblies, i.e. first absorbed layer 46 (being commonly referred to as transfer layer) and second absorbed layer 48 (be commonly referred to as and absorb the heart), and perhaps, a simple layer (i.e. second absorbed layer 48) just can form absorption system 44.These layers are described as follows:

Main body-cover layer

Cover layer 42 is a relative low-density, large volume, high bulk adhesive-bonded fabric flaky material.Cover layer 42 can be only by a kind of fibrous, and for example polyester, polypropylene or cover layer 42 also can be fibrous by two compositions of low melting point and high-melting-point composition.These fibers can be selected from multiple natural and synthetic material, for example nylon, polyester, artificial silk (rayon combines with other fiber), Cotton Gossypii, tacryl and similar product, and combination.An example is by Canadian Montreal Johnson﹠amp; The adhesive-bonded fabric cover layer of the product that Johnson Inc. company is sold StayfreeUltra-Thin Cottony Dry Cover cotton wool by name.

Two composition fibers can be made up of the polyester core heart and polypropylene overcoat.Use suitable two composition materials can obtain fusile adhesive-bonded fabric.The fusible cloth of this kind has illustrated on November 5th, 1985 and has awarded in No. the 4th, 555,446, the United States Patent (USP) of Mays.Use fusible cloth can increase cover layer and be arranged on first absorbed layer of adjacency and/or the easiness on the barrier layer.

Though comprise tectal individual fibers hydrophilic is not arranged especially, cover layer 42 is good to have high relatively wettability.Covering layer material also should comprise many big relatively holes.Because cover layer 42 is wanted to admit apace body fluid and body fluid is carried away from health and inflow point.Advantageously, the fiber of forming cover layer 42 also can not lose its physical characteristic with Hou getting wet, and in other words, the fiber of cover layer 42 would not collapse when contact water or body fluid or followed the string.Cover layer 42 can be treated to allow liquid to flow through immediately, and cover layer 42 also has the function that liquid is transported to fast other layer of absorption system 44.Therefore cover layer 42 advantageously has wettability, hydrophilic and porous.When cover layer 42 by synthetic hydrophobe fiber (for example polypropylene or two composition fiber) when forming, cover layer 42 can be treated to have interfacial agent to obtain required wettability.

Perhaps, cover layer 42 also can be made by the polymer with macroscopic void.By this high permeability of what, thin film has been realized the function of quick transmission body fluid to the internal layer of absorption system.Foraminous co-extruded thin film, as United States Patent (USP) the 4th, 690,679 description persons, and at the Johnson﹠amp of Canadian Montreal; Be available person on the cotton wool that Johnson Inc. sold, can be used as cover layer among what the present invention.

Cover layer 42 can be embossed into the remainder of absorption system 44 via it being fused to down on one deck, to help promoting fluid to transmit.This kind fusion can be implemented in cover layer 42 and the entire contact surface of absorption system 44 or only some positions carry out partly.Perhaps, cover layer 42 can be by the attached work of other method (for example adhesive) to absorption system 44.

Main body-absorption system-first absorbed layer

With first absorbed layer 46 in abutting connection with the inboard of cover layer 42 and be bonded to cover layer 42 to form the some of absorption system 44.First absorbed layer 46 is provided with and is received from body fluid that cover layer 42 flows into and body fluid is maintained always, till the second beneath absorbed layer absorbs this body fluid.

First absorbed layer 46 is with more intensive for good and have than cover layer 42 more most fine pore is arranged than cover layer 42.These make the absorbed layer 46 of winning can contain body fluid and maintain body fluid, make the outside of body fluid away from cover layer 42, by this, prevent that body fluid from getting cover layer 42 and surface thereof wet once more.Yet, first absorbed layer 46 too densification in order to avoid liquid can not be from second absorbed layer 48 under first absorbed layer 46 flows into.The absorbent layer of these patterns is normally as the fluid transfer layer or obtain layer.

First absorbed layer 46 is by fibrous material for example wood pulp, polyester, artificial silk (rayon), elastic foam or fellow, or this type of combination is formed.First absorbed layer 46 also can comprise thermoplastic fibre so that stablize this layer and keep the integrity of its structure.The one or both sides of first absorbed layer 46 can be treated to add interfacial agent to increase wettability, and but, first absorbed layer 46 generally is as hydrophilic, and must not handle.Both sides combination or adhesive layer to adjacency (being second absorbed layer 48 of cover layer 42 and below) with first absorbed layer 46 are good.The example of the first suitable absorbed layer is by Tennessee, and paper pulp is cohered in the ventilation of the VIZORB3008 by name that BUCKEYE sold of Memphis.

Main body-absorption system-second absorbed layer

Be close to first absorbed layer 46 and agglutinating be second absorbed layer 48.

In one embodiment, first absorbed layer 46 has a central width, and central width with second absorbed layer 48 is identical at least for it.In what one specific embodiments, the about 64mm of the big what of this central width.In another embodiment, first absorbed layer 46 has a central width, and it surpasses the central width of second absorbed layer 48." central width " speech is relevant with the special area of one deck, can be according to the absorbent layer of following manner decision as one.Reference point on the sample layer when finding out wear below the center of position what vaginal orifice.Find out a parallel what cross central line 36 and in the mons pubes pubis direction of user apart from the plane of reference point the place ahead 3.75cm.Also find out another parallel what centrage 36 and in the buttocks direction of user apart from the plane of reference point Hou side 5.0cm.The absorption width that the expansion of the maximum of the sample layer between what two planes, incompressible, the non-lateral width of being controlled are sample layers.

When the central width of absorption system, what absorption system comprise most absorbed layer, be the central width that absorption system has the layer of maximum central width.In a specific example, the central width of absorption system surpasses 64mm.

In one embodiment, second absorbed layer 48 is mixture that the cellulose fiber peacekeeping is configured in the superabsorbent fibers in that paper pulp fiber.

In a special example, the material of second absorbed layer 48 comprises: about certainly 40 percentage by weights are to the cellulose fibre of about 95 percentage by weights; Reach from 5 percentage by weights the SAP to about 60 percentage by weights (super absorbent polymer).About 10 percentage by weights of the little what of the moisture content of this material." percentage by weight " used herein is the weight of ingredients substance shared in the weight of each final material.For example, the SAP of 10 percentage by weights represents to have in the material basis weight of every 100g/m2 the SAP of 10g/m2.

Cellulose fibre in available what second absorbed layer 48 is known and comprises wood pulp, Cotton Gossypii, Caulis et Folium Lini and peat moss.Wood pulp is preferred.Paper pulp can derive from machinery or chemical machinery, sulfite cellulose method, kraft pulp, garbage slurry, organic solvent paper pulp etc.Cork and hardwood two classes are all useful.Soft wood pulp is preferred.When in this material, using cellulose fibre, need not handle cellulose with chemical dispersion agent, cross-linking agent or similar product.

Second absorbed layer 48 can contain any known super absorbent polymer (SAP).With regard to purpose of the present invention, " super absorbent polymer " or " SAP " refers to the sort of material that can absorb and keep the body fluid of at least 10 times of weight of what own under 0.5psi pressure.Super-absorptive particles of the present invention (particle) can be inorganic or organic, cross-linked hydrophilic polymer, for example polyvinyl alcohol, ethylene oxide polymer, crosslinked starch, Gua Er (guar) glue, Radix Astragali (xanthan) glue and analog.The form of this particle can be powder, grain (grain), granule (granules) or fiber.With what superabsorbent polymer particles of the present invention is the numbering SA60N TYPE II * product that crosslinked polyacrylate is for example sold by the Sumitomo Seika Chemicals company of Osaka, Japan, and is sold by the Chemdal International company of Illinoi State, The United States Palatine and to number the 2100A* product.

In a special example, second absorbed layer 48 is a kind of comprising from about 50 percentage by weights to the cellulosic fibre material of about 95 percentage by weights, and more clearly says to be the cellulosic fibre material to about 80 percentage by weights from 60 percentage by weights approximately.This material comprises the SAP to about 60 percentage by weights from about 5 percentage by weights, with about certainly 20 percentage by weights to the SAP of about 55 percentage by weights be preferable, SAP from about 30 percentage by weights to about 45 weight ratios is for better, and the SAP of about 40 percentage by weights is best.

The gas that second absorbed layer 48 can this skill be known is put (air-laying) device (please referring to Fig. 5) and is made.According to Fig. 5, utilize machine to handle cellulose fibre (as wood pulp) so that disperse (individual) fiber.Dispersive fiber mixes in hybrid system 1 with the SAP particle, and right Hou pneumatically delivers in a series of formation 2.Each forms head can control mixing and distribution of fiber and SAP particle separately.In each formed head, the controlled atmosphere circulation distributed paper pulp and SAP uniform mixing with the agitator that the wing is arranged.SAP can thoroughly and equably be mixed in the what all material, perhaps by being assigned in the selected formation head, and only exists in the what certain layer.The fiber (and SAP) that comes the self-forming head to forming on the net 3, and forms lamellated absorbability sheet with vacuum moulding machine.Compress the density of these sheets with Hou with calender 4 to obtain wanting.Utilize the conventional roll winding apparatus that the sheet of densification Hou is rolled into Roll Sushi 5.Available thin paper covers and forms net 3 to reduce the leakage of material.This thin paper is removed before the calendering program, maybe can incorporate the material of shaping Hou into.In possible different examples, first absorbed layer 46 can obtain single absorption system 44 with second absorbed layer, 48 whole formation, this can be shown in Figure 5 equipment and an extra formation (not shown), before the calendering program and with the air method for placing, deposition layer of material and form first absorbed layer 46 on second absorbed layer 48.

Second absorbed layer 48 of the present invention has high density, and in a particular example, has the density of the about 0.25g/cc of big what.Say that clearly second absorbed layer 48 has the density to about 0.50g/cc from 0.30g/cc approximately.More clearly say, this density approximately from 0.30g/cc to about 0.45g/cc, and more clearly say again, approximately from 0.30g/cc to 0.40g/cc.

The assimilate that the gas mode of putting produces typically has low-density.For obtaining higher density, as the example of above-mentioned second absorbed layer 48, the material that uses calender densification gas shown in Figure 5 to put.Use device known in this skill to finish densification.Typically, these densification are to implement under about 100 ℃ of temperature and every millimeter about 130 newton's load.Last densification roller is formed from steel, and the densification roller is the flexible roller of the about 85 SH D of hardness down.Up and down the densification roller the two to be good smoothly, but, last densification roller can have rag.

In one embodiment, (measured value is a milligram to the Gurley stiffness of second absorbed layer 48 (Gurley stiffness), and mg) ratio to density (measured value is that the gram of every cube of cm is counted g/cc) is low what about 3700.In a particular example, the Gurley stiffness to the ratio of density be little what about 3200 and, more clearly say, be approximately little what 3000.

The Gurley stiffness is one of numerous softness indexs.The bendability of Gurley stiffness measurement absorbent material or flexible.The Gurley stiffness value is lower, and then this material more has flexible.The Gurley stiffness value is to measure with Gurley stiffness test machine (Gurley Stiffness Tester, model 4171E is by Gurley Precision Instrument ' the s manufacturing of New York, United States Troy).This machine is that an end is fixed and the other end is subjected to the test pieces of the specific dimensions of lumped load, measures it when producing specified amount of bow, the required applied moment that applies.The result is exactly a stiffness value, and unit is a milligram, mg.

Second absorbed layer 48 Yan Shiqiang's with its softness.The pad integrity is a kind of known measurement of absorbent material intensity.In a specific embodiment, second absorbed layer 48 represents its intensity (high pad integrity) in wide density range.In a specific embodiment, the pad integrity of second absorbed layer 48 (measured value is newton (N)) is to the big what of ratio about 25.0 of density (g/cc).In a particular example, big what of this ratio about 30.0 and even the about 35.0. of what greatly.The pad integrity test is to carry out on Instron multifunctional testing machine (Instron Universal TestingMachine).Basically, this thermometrically is wanted the required load of tear fracture specimen, and is for example illustrated in " PFI method in 1981 ".The sample that a slice 50mm is wide, 50mm is long is clipped on this test machine with suitable tie down device.The piston of diameter 20mm is with die-cut this fixed sample of the speed of 50mm/min.Can measure and thrust the required strength of sample, unit is newton (N).

The second absorbed layer 48 extensively basis weight of scope is prepared.The basis weight that second absorbed layer 48 has at about 100g/m2 to about 700g/m2 scope.In a particular example, this basis weight system approximately from 150g/m2 to about 350g/m2.The about 200g/m2 of basis weight is good to about 300g/m2 scope, and so that about 250g/m2 is preferable.

Second absorbed layer 48 can form three or four layers.Those layers comprise a bottom, one or two layer of intermediate layer and one deck top layer.The specific embodiment of trilaminate material and four layer materials is in following explanation.SAP can be included in arbitrary layer or whole in these layers.SAP concentration (percentage by weight) in each layer can change according to the difference of indivedual SAP essence.

An interesting characteristic of second absorbed layer 48 is when it bears mechanical stress, and it keeps the ability of SAP.Second absorbed layer 48 bear 10 minutes long when acutely shaking, it can keep surpassing the SAP content of 85 percentage by weights.Say that clearly material of the present invention keeps surpassing 90%, more clearly says, surpasses 95%, more clearly says, surpasses 99% SAP under these mechanical stresses.By the material in the Ro-Tap Sieve Shaker (sieve shakeout machine) that shakes the W.S.Tyler company manufacturing that is placed on Ohio, USA Cleveland, the percentage ratio of the SAP that decidable kept.Say that more clearly sample is placed in the sieve (Tyler series of products) of 28 holes (mesh).Other has other sieves in 35 holes and 150 holes to append to this first sieve, to form the gradually little sieve post of hole.The two ends of sieve post are covered, to prevent fiber and/or SAP leakage.This sieve post is placed in the shakeout machine and stirred 10 minutes.Set remain in each sieve the SAP particle and with SAP and cellulose fibre the two separates, just can determine the amount of the SAP particle (" free SAP ") shaken to cause drop from sample.

Even if be to make with multilamellar, the final thickness of second absorbed layer 48 of shaping is still very little.This thickness can change to about 2.5mm Zi about 0.5mm.In a particular example, the about 1.0mm of this thickness arrives about 2.0mm, and more clearly says, about 1.25mm is to about 1.75mm.

Particularly suitable is presented at Fig. 6 at an example of second absorbed layer 48 of cotton wool 20.The basis weight of this second absorbed layer 48 is from about 200g/m2 about 350g/m2 extremely, and density from about 0.3 to 0.5g/cc.In a special example, density to 0.45g/cc, more clearly is 0.4g/cc Zi about 0.3g/cc.

Second absorbed layer 48 among Fig. 6 (a) is to form three layers in the gas mode of putting: paper pulp bottom (not having superabsorbent fibers), the about 25g/m2 of basis weight; Intermediate layer, its basis weight be about 150g/m2 and comprise from about superabsorbent fibers of 10 to about 30g/m2 and Zi about 120g/m2 the paper pulp to about 140g/m2; And paper pulp top layer (not having superabsorbent fibers), the about 25g/m2 of basis weight.Total basis weight of relative what second absorbed layer 48, the scope of superabsorbent fibers (accounts for the superabsorbent fibers of how many g/m2) in every g/m2 material certainly about 5 to 15 percentage by weights.In a special example, the amount of superabsorbent fibers Zi 7.5 percentage by weights of this material approximately to about 12.5 percentage by weights.The superabsorbent fibers that more clearly contains 7.5 percentage by weights for this material.So, the intermediate layer of this material comprise from about superabsorbent fibers of 15 to about 25g/m2 and Zi about 125g/m2 the paper pulp to about 135g/m2, reach more clearly paper pulp for the superabsorbent fibers of about 20g/m2 and about 130g/m2.Contain the intermediate layer of superabsorbent fibers and paper pulp can homogeneous mixture or the mode of heterogeneous mixture insert, wherein the amount of superabsorbent fibers is looked with the degree of closeness of bottom and is changed.

In another embodiment shown in Fig. 6 (b), this second absorbed layer 48 forms four layers with the gas method of putting.In this embodiment, above-mentioned intermediate layer is replaced by two-layer intermediate layer: first intermediate layer and second intermediate layer in abutting connection with bottom in abutting connection with top layer.Each first and second intermediate layer each self-contained approximately from 10 to about 30g/m2 superabsorbent fibers with approximately from 40 to 65g/ paper pulp.When desire is kept away from cover layer 42 with the liquid that is absorbed, can adjust the amount of superabsorbent fibers in first and second intermediate layer, make the superabsorbent fibers amount in second intermediate layer more.Superabsorbent fibers in first and second intermediate layer can be identical or different superabsorbent fibers.

In one embodiment, the cellulose fibre that is used in second absorbed layer 48 is a wood pulp.Wood pulp has some characteristic that he is used at this by suitable especially what.Fiber in most wood pulp has the crystal form that is called cellulose, and cellulose can be transformed into the shape that is called cellulose.In second absorbed layer 48, the wood pulp that to have quite most cellulose be cellulose can be utilized.Similarly, the wood pulp with fiber crimp value of increase is favourable.Hou, the wood pulp with hemicellulose amount of minimizing is preferred.In this skill, being used for handling wood pulp is known with the device of these characteristics of optimization.For example, knownly handle wood pulp cellulose being transformed into the cellulose structure, and increase the fiber crimp value with liquid ammonia.The dry fiber crimp value that increases wood pulp of the moment universe is known.Cold causticity is handled wood pulp can reduce the hemicellulose amount, increases fiber crimp, and cellulose is transformed into the cellulose shape.So, to comprise the wood pulp that the cold causticity of at least one part handled be favourable to the cellulose fibre that is used for making material of the present invention.

The U.S. patent application case number 08/370,571 of application in 18 days January nineteen ninety-five of what is seen in the explanation of cold causticity extracting process; Before this case was the part of application in what on January 21st, 1994 U.S. patent application case number 08/184,377 that continues, and now abandoned.Reference thought in whole this literary composition of incorporating into of the content of two application cases.

Say that simply causticity is handled typically 60 ℃ of the low whats of temperature, but be good for 50 ℃ with the low what of temperature, and to carry out to preferable between 10 ℃ to 40 ℃ of temperature.Preferred alkali metal saline solution is newly formed sodium hydroxide solution, or the side-product in wood pulp or the paper plant's operation, for example half causticity burn alkali liquid, through the burning alkali liquid * and the fellow of oxidation.Also can use other alkali metal salt, for example aqua ammonia and potassium hydroxide and analog.But by the cost viewpoint, sodium hydroxide is preferred salt.The concentration of alkali metal salt typically between about 2 to 25 percentage by weights of solution, is preferably at 6 to 18 percentage by weights.Handled to good from the alkali metal salt of about 10 to 18 percentage by weights with concentration with the wood pulp that what height ratio, fast Absorption are used.

Close the more detailed structure and the manufacture method of what second absorbed layer 48, please refer to the United States Patent (USP) got permission in 2 days February in 1999 awarding to people such as Tan the 5th, 866, No. 242.The content of this patent is incorporated this paper into as a reference.

Main body-barrier layer

Be barrier layer 50 under absorption system 44, there is the fluid impermeable membrane material on barrier layer 50, and the liquid that so prevents to be trapped in the absorption system 44 flows out the underpants that pollutes user from cotton wool.Barrier layer 50 is made for good with the polymerism film.

Cover layer 42 and barrier layer 50 can keep absorption system 44 sealing of sealing or edge sealing along its edge join to form.The means that engage can be: adhesive, heat sealing, ultrasound combination, radio wave involution, mechanical Zhe song, reach similar means or their combination.In Fig. 1, indicate this peripheral seal line with code name 52.

Fin

38 and 40 is good with the one extending part that makes cover layer 42 and barrier layer 50.Mat is shown adhesive, heat sealing, ultrasound combination, radio wave involution, mechanical Zhe song, is reached similar means or their combination, and these one extending parts are engaged with each other together along their edge seal position.Best is, is bonded to each other with when sealing absorption system 44 at cover layer 42 and barrier layer 50, finishes above-mentioned combination simultaneously.Perhaps, fin can be provided with absorbing material between the extending part on cover layer 42 and barrier layer 50, and these absorbing materials can be first absorbed layer 46 or second absorbed layer 48 or the extending part of the two.

Cohere system

With reference to Fig. 2 and Fig. 3, in order to strengthen the stability of cotton wool, adhesive 58 is located in being provided with towards garment surface of barrier layer 50, and typical hot melten type binding material energy and underpants material are set up temporary transient combination.The material that is fit to is the HL-1491XZP composition that the H.B.Fuller Canada company of Ontario, Canada Toronto sells.Comprise that a pair of longitudinal axis 34 along cotton wool 20 extends and cohere the pattern in district 59 that according to one the location adhesive is applied in the surface towards clothes on what barrier layer 50 in abutting connection with the linearity of the lateral margin of cotton wool 20.Length and width that linearity is cohered district 59 can change according to desired application.Generally speaking, it is longer and wideer that linearity is cohered district 59, then can be higher with cohering of user underpants.It is successive that linearity shown in the figure is cohered district 59.This is the preferred form of structure, but linear seriality of cohering the district is not indispensable key element.In a possible variation, linearity is cohered the district and can be formed by the point or the array of spots of adhesive, and this lattice array system extends and generally in abutting connection with the lateral margin of cotton wool along the longitudinal axis 34 of cotton wool.

It is straight line parallel to each other that linearity is cohered the district, but it also can be a curve.The grazing that linearity is cohered district 59 is not the indispensable characteristic of the present invention.

The preferred form of structure of the present invention is also included within the district of cohering on

fin

38 and 40.

Before using cotton wool, standard discharges paper 82 (only showing at Fig. 3) and covers location adhesive 58, bonds to cotton wool or exotic because of carelessness to prevent adhesive 58.Discharge paper and have traditional structure (for example coating the wet kraft paper wood pulp of putting method formation of silicon ketone), the release paper that is fit to is U.S. New Jersey, FRASER 30#/61629 products that the Tekkote company of Leonia sells.

The main body of cotton wool has the pattern in a priority bending district, and certain three-D profile when using to assist cotton wool to comply with is folding.In this manual, " 3 D deformation profile " meaning is promptly in the distortion of Z direction (vertical direction).Fig. 7 illustrates the example of this three-D profile.Fig. 7 illustrates the cotton wool 20 of Fig. 1 in the cross section of obtaining " W " pattern, wherein the middle body of cotton wool 20 rises to form central authorities and goes up the summit, and the zone of cotton wool 20 between central area and

vertical side

30,32 then is folded to form two downward summits downwards.This folded configuration is considered to reduce the probability of leakage, is the vaginal orifice of position at close user because the summit is gone up by central authorities, and therefore, it is near fluid discharge source and can more preferably obtain liquid.

The structure of the cotton wool example of Fig. 1 has the pattern in a priority bending district (three-dimensional is arranged), promptly a pair of

priority bending district

102 and 104 and one central bend district 100.

Priority bending district

102 and 104 is linear (they can follow a flat line or a sweep), and common longitudinal axis 34 extensions along cotton wool 20.In this example, it is arcual a little that

priority bending district

102 and 104 is shown, and more particularly, the lateral margin of its relevant what cotton wool 20 curves inwardly.

Priority bending district

102 and 104 is also straight.

Priority bending district

102 and 104 lateral margins in abutting connection with cotton wool 20, and better extend along the major part of cotton wool length.In the particular example that implements, there is the length of 50% (and preferably more) that is at least the total length of cotton wool 20 in

priority bending district

102 and 104.

Align with the discrete district 59 of vertically cohering in priority bending district 102 and 104.In this manual, " alignment (registering) " meaning is that the priority bending district has identical longitudinal extension orientation with the district 59 of vertically cohering that is associated, and meaning is that at least a portion approximate vertical alignment in priority bending district is vertically cohered and distinguished 59." alignment " must not hint that priority bending district and the district 59 of vertically cohering that is associated are same range as or identical accurate geometry (flat line or curve) or accurately alignment each other.Preferable, aligned condition exists so that in the boundary of vertically cohering the district that the involved what in priority bending district is associated.

Cotton wool also comprises a central priority bending district 100, and it is formed on the cross point of the inclination priority bending line that majority intersects each other.This inclination priority bending line is arcual, and produces on what cover layer and the absorption system.In this particular example, the priority bending line intersects each other and forms a crosspoint array.This cotton wool and is weakened and upwards preferential folding at its longitudinal axis when allowing the cotton wool what to be subjected to lateral compression in this positional structure in the position, cross point on the longitudinal axis of cotton wool.This crosspoint array forms central priority bending district 100.

Each priority bending line that the cross point forms the sweep array in central priority bending district 100 generally extends along the angles that the longitudinal axis 34 of the main body of a relevant what cotton wool 20 is 45 degree.This pattern is designed so that each priority bending line and at least two other priority bending lines intersect.And each priority bending line extends to relatively vertically lateral areas from a vertical lateral areas of cotton wool, and intersects with the imaginary longitudinal axis of cotton wool.Vertically the lateral areas is defined as the part of cotton wool, and it extends internally from discrete vertical lateral margin 30,32 (this lateral margin forms the external boundary of this lateral areas) (this vertical lateral margin is regarded as the part of vertical lateral areas).There is a width of about 25% for the maximum transverse size of main body 22 (not comprising fin) each lateral areas.

Must not be intended to be subjected to the restriction of a particular theory, believe that these most inclination priority bending lines are helpful to the ability that what increases cotton wool opposing deflection, and this effect be gathered for stablizing the cotton wool antagonism.Simultaneously, inclination priority bending line forms on its cross point of central priority bending 100 whats.

In a particular example, the spacing between the what priority bending line is about 2cm.

Select among the embodiment one, priority bending district 100,102 and 104 only produces on the what absorption system, on first absorbed layer 42, second absorbed layer 48 or both, make in priority bending district on the cotton wool 100,102 and 104 be that situation about being created on cover layer and the absorption system is not more seen than priority bending district 100,102 and 104.

In another selects embodiment, the unique longitudinal extension Curved Continuous curve crosspoint array of desirable generation that extends along the longitudinal axis 34 of cotton wool.

Person as discussed above, the pattern of the buckled zone of cotton wool 20 can assist cotton wool to obtain the 3 D deformation profile.This 3 D deformation profile comprises " W " profile among other possibility profile of what.Embodiments of the invention design shown in Figure 1 is can preferentially folding according to " W " pattern, as shown in Figure 7.When cotton wool was subjected to lateral compression, it was folding and form on this position of 200 whats, a central summit on longitudinal axis 34, and also in two longitudinal extension

priority bending districts

102 and 104 places folding downwards and form two downward summits 202 and 204.When what is responded lateral compression and can be produced the zone that folds when cotton wool is cohered what user underpants, what

priority bending district

100 and 102 and cohere vertically that the favourable what of aligned condition between the district 59 is capable to become two downward summits 202 and 204.This allow cotton wool 20 in a kind of more expected mode the folding what of nonrandom and uncontrollable mode its be hoped folding part.

Manufacture method

Above-mentioned 20 embodiment makes in a conventional manner according to conventional art.Clearly say, make a kind of laminated construction (in this skill, being sometimes referred to as sheet material (web)).This laminated construction comprises a sheet of material of making cotton wool.In other words, in proper order, this laminated construction comprises: a sheet of covering layer material from top to bottom; A sheet of 46 materials; A sheet of 48 materials (according to the said method manufacturing); And Hou, a sheet of barrier material.In laminated construction, some these material can not be adjacent, in the case, these materials according to they in final products to each other position relation and accurately place.Right Hou cover layer and barrier layer are in position located to be applied in pressure and are combined, thereby produce the periphery sealing.The means of involution can be: heat sealing, ultrasound combination, radio wave involution, mechanical Zhe song, and similar means or their combination.Now, the structure that will seal on sheet material is cut off and formation article separately with traditional means (promptly die-cut, jet fluid cuts or laser).

Central authorities priority bending district 100 and

priority bending district

102 and 104 preferable systems are formed by embossing.The selection of embossing is not important, because identical result can form as fluting, punching or other technology from being familiar with other method known to this this journey dealer.If select the embossing operation to produce the priority bending district, then cotton wool system is passed through between a pair of roller, and one of roller comprises the outthrust according to the embossing pattern of wanting.The material of outthrust partial compression cotton wool (it can be the combination of cover layer and absorption system, or has only absorption system) compresses this material by this.The kind of the visual embossed material of institute's applied pressure degree between the embossing operational period and embossed material in other material physical integrity and change.Being familiar with this skill person can find according to suitable processing conditions of the present invention.Generally speaking, embossing pressure should be selected with fully with the local densification of material producing the priority bending district, and simultaneously can be too not high and cut off material.Heating this pinking roller has been found to be favourable.And also available ultrasound embossing is to form the priority bending district.

The best whole cotton wool of embossing because of embossing also keeps together the variant layer of cotton wool, and reduces the probability that when cotton wool is folded cover layer or barrier are gapped or fluff.

Right Hou location adhesive is applied on the barrier layer and vertically coheres district 59 to produce, and reaches other any district of cohering according to possible situation, and now discharges paper and covers the location adhesive.Alternate, can before cut off from sheet material (web), indivedual cotton wools will locate adhesive or location adhesive and be applied on the sheet material with release paper.

As previously mentioned, the thickness of cotton wool 20 is about 5mm or still less.The required equipment of thickness of measuring cotton wool is that the foot dials (thickness) that has that Ames supplies is counted, and it has the foot of pillar, 1 and 1/8 inch diameter, and 2 ounces of net weight, reading are accurate to 0.001 inch.The digital type thickness gauge is preferential the selection.If the cotton wool sample folds individually and packs, then untie packing of sample and careful leveling sample with hands.Take off release paper from sample, right Hou will discharge paper and be attached to gently on the adhesive line, not want compression sample, and guarantee to discharge paper and lie low on sample.Before the thickness at measuring samples center, with fin (if the words that have) below the folding what sample of Hou.

The foot of rising thickness gauge is placed on sample on the anvil, the foot that makes thickness gauge roughly the position in central authorities' (or being placed on the position of wanting of the sample of wanting) of sample.When falling this foot, must be very careful to avoid this foot to drop on sample or to have applied strength improperly.Reading is just adopted when Hou was stablized in about 5 seconds.

The counter-bending power of cotton wool is preferably at about certainly 400g to the scope of about 800g.The counter-bending power of cotton wool is to measure with peak value flexural stiffness (peak bending stiffness).Peak value flexural stiffness system is decided by a test; This test is to imitate ASTM D 4032-82 circular bend procedure (CIRCULAR BENDPROCEDURE), and this program is revised in a large number and following mode is carried out.Multidirectional distortion when circular bend procedure is a material, a surface of one kind of becomes recessed, and that another surface becomes is protruding.Circular bend procedure produces a relevant counter-bending power, the strength value of the average stiffness in all directions of what simultaneously.

Circular bend procedure must device be a circular bend stiffness tester of revising, have following part:

1. the plate platform of a smooth, polished, it is 102.0mm * 102.0mm * 6.35mm, has the hole that a diameter is 18.75mm.It is the 4.75mm place to the degree of depth that the milled border in hole should be miter angle;

2. a plunger, total length is 72.2mm, diameter is 6.25mm; It has the pommel that radius is 2.97mm, and a needle point; This needle point extends 0.88mm from this pommel, and the base diameter and with 0.33mm has the tip of the radius of little what 0.5mm; This plunger to be being mounted with the concentric mode in this hole, and has equal gap on the what all sides.Please note that this needle point only is for preventing to test test specimens shifted laterally originally.Therefore, if the serious unfavorable shadow of needle point to test sample book (as, an inflatable structure punctures), then should not use needle point.Plunger base should be set in the over top of this orifice plate well.From then on position, the downward stroke in pommel is the correct bottom to this orifice plate;

3. a force measurement meter; And more clearly saying it, is an Instron reverse compression load cell.This load cell has from about load range of 0.0 to about 2000.0g.

4. an actuator, and more clearly say it, for having the Instron model of a reverse compression load cell.This Instron 1122 is made by the Instron Engineering Corporation of Mass. state Canton.

For carrying out the program of this test, as explained below, cotton wool that need five representatives.From five of wanting tested cotton wool, cut out the test sample book that some add up to the 37.5mm * 37.5mm of " Y ".Those samples with following part then should be not tested: promptly in this part of what, a cover layer directly is attached to a barrier layer, or this part is the assembly that the lamination on a cover layer and a barrier layer does not have any absorption system.The whole flexibility of the more relevant what cotton wool of this test, and be not the flexibility of its peripheral part, therefore, the flexibility of the absorption portion of the more relevant what cotton wool of flexibility of the present invention.

Test sample book is should tested personnel folding or crooked, and picking and placeing of sample must be tried one's best less and should only be touched the sample edge position to avoid shadow to counter-bending character.Cut out identical with the sample that cuts out from first cotton wool with the sample that adds up to the 37.5mm * 37.5mm of " Y " from four remaining cotton wools.Therefore, the tester should have five same samples of " Y " array.

The process of circular bend procedure is as described below.By nursing one's health sample in the room of the relative humidity of sample being stayed 21 ± 0.1 Celsius temperature and 50% ± 2.0% in two hours.Test board is set level.It is per minute 50.0cm that velocity of plunger is set at every haul distance fully.One sample is by on the porose platform below the what plunger of feeling relieved, and makes the cover layer 42 of sample towards barrier layer 50 object platforms of plunger and sample.Check to clap and show making zero of device, and then adjust it if needed.Plunger activated.At test period, should avoid touching sample.The peak power reading of the most approaching gram of record (gram) number.Above-mentioned steps is heavily covered up to testing all five identical samples.

Calculate

The peak value flexural stiffness of each sample is the peak power reading of this sample.Five same samples remembeing " Y " array are cut out.Test five values respectively organizing five same samples and will obtain and ask its meansigma methods.Therefore, for each group of " Y " test group, the tester has a meansigma methods now.The bending resistance of cotton wool is the maximum of these average peak flexural stiffnesses.

Product and method for health and other health awareness purposes of the present invention used, can by any be familiar with the known or hygienic protection known in the future of this skill person, gatism, medical treatment reach absorption process and technology realizes.Therefore, various corrections and the variation that does not break away from claim of the present invention and equipollent contained in the present invention.

The main element conventional letter to as directed

1 hybrid system

2 form head

3 form net

4 calenders

5 Roll Sushis

20 cotton wools

22 main bodys

26 first cross sides

28 second cross sides

30 first vertical sides

32 second vertical sides

34 longitudinal centre lines

36 cross central lines

38,40 fins

42 cover layers of fluid thoroughly

44 absorption systems

46 first absorbed layers

48 second absorbed layers

The barrier of 50 not saturating fluids

52 periphery sealings

59 linearities are cohered the district

82 standards discharge paper

100 central bend districts

102,104 priority bending districts

Claims

1. one kind is fit to by the cotton wool of the hip lower part of wear what underpants, and this cotton wool has a relative longitudinal extending side edge and a longitudinal axis, and comprises:

A) one can saturating fluidic cover layer;

B) absorption system below this cover layer of what, the absorption width of this absorption system is at least 64mm;

C) the impenetrable liquid barrier layer below this absorption system of what;

D) the about 5mm of the little what of the thickness of this cotton wool;

E) this impenetrable liquid barrier layer comprises that a pair of linearity coheres the district, and it extends and in abutting connection with the respective side edge of cotton wool, this linearity is cohered the district cotton wool is cohered on the what underpants along this longitudinal axis;

F) this absorption system comprises at least one pair of priority bending district, it extends and in abutting connection with the respective side edge of cotton wool along this longitudinal axis, this priority bending district discrete linearity of aliging is cohered the district, this priority bending district allows cotton wool to fold in this priority bending district and applies the lateral compression of this cotton wool of what with response, and allows this cotton wool to obtain the 3 D deformation profile.

2. cotton wool as claimed in claim 1, the wherein about 400g of the not little what of counter-bending power of this cotton wool.

3. cotton wool as claimed in claim 2, wherein this cotton wool has relative vertical lateral areas, this cotton wool comprises the priority bending line that relevant this longitudinal axis of what tilts to extend, this priority bending line extends to a vertical relatively lateral areas from a vertical lateral areas of this cotton wool, and crossing with the longitudinal axis of this cotton wool.

4. cotton wool as claimed in claim 3, wherein this cotton wool comprises most priority bending lines intersected with each other and defines a crosspoint array.

5. cotton wool as claimed in claim 4, wherein extend along this longitudinal axis in the cross point in this crosspoint array, and just this cotton wool of what is folding in the position along longitudinal axis, and this crosspoint array forms a central priority bending district.

6. cotton wool as claimed in claim 1, wherein this 3 D deformation profile is a W profile.

7. cotton wool as claimed in claim 1, wherein this priority bending fauna is formed by being selected from the method that constitutes cohort by punching, fluting, cutting and embossing.

8. cotton wool as claimed in claim 1, wherein this priority bending district is arcual.

9. cotton wool as claimed in claim 1, wherein this priority bending district with vertically cohere individually the district align.

10. cotton wool as claimed in claim 1, wherein this cotton wool comprises one from the outstanding fin of a lateral edges of cotton wool, this fin can be folding around an edge of this underpants hip lower part, to keep on this cotton wool what underpants.